NO. 2063. NORTH AMERICAN PARASITIC C0PEP0D8— WILSON. 607 



Carpionis, head large, more than a fourth the length of the animal, ovate, much 

 longer than wide, making with the trunk a right angle or one a little acute. Arms 

 shorter than the trunk, often pressed against the surface of the underlying segment; 

 bulla large, orbicular, very convex, black, homy, with an elongate and slender ped- 

 icel. External egg sacks of medium size with three or four transverse rows of eggs. 



In Ki'0yer's figures there are also decided differences in the struc- 

 ture of the maxilHpeds and second antennae, wliich make his specific 

 distinction a vaUd one, and accordingly the two species have both 

 been placed in the new genus Salmincola. 



SALMINCOLA SALMONEA (Gissler). 



Plate 29, figs. 18 to 22. 



Lax-liLsen, Lernaea salmonea Gissler, ^ 1751, p. 185, pi. 6, figs. 1-5. 

 Lemaea salmonea Linnaeus, 1761, p. 509, No. 2102. 

 Schisturus salmoneus Oken, 1816, p. 183. 

 Entomoda salmonea Lamarck, 1818, p. 686. 

 Lemaeopoda salmonea Blainville, 1822, p. 443. 



Host and record of specimens. — Three females with egg strings from 

 the gills of a salmon at Bamffshire, England, were obtained by ex- 

 change from Canon A. M. Norman, and are numbered 8339, U.S.N.M. 



A second lot of six females was obtained by R. Hitchcock from 

 the gills of salmon in England and is numbered 39608, U.S.N.M. 



Specific characters of female. — Cephalothorax short and stocky, 

 three-lobed in dorsal view, being enlarged posteriorly through the 

 bases of the second maxillae; separated from the trunk by a distinct 

 groove; no dorsal carapace. Trunk a flattened ovoid or pyriform, 

 narrowed anteriorly into a short neck, considerably enlarged and 

 often somewhat thi-ee-lobed posteriorly, with a minute genital process 

 at the center of the median lobe; no abdomen, anal laminae, or pos- 

 terior processes. 



First antennae short and tipped with a minute spine; no external 

 indication of segmentation. Second antennae biramose; exopod 

 longer and larger than the endopod and tipped with a large curved 

 spine and two or tlu^ee smaller ones; both rami one-jointed. 



First maxillae slender and tipped with three small jointed setae, 

 no palp; second maxillae, including the bulla, the same length as, or 

 sHghtly shorter than, the entire body, joined at the tip to a large 

 ovate bulla, sometimes by a single pedicel, sometimes by two dis- 

 tinct pedicels. Bulla as wide as both maxillae together, concave 

 ventrally, convex dorsally, thickened and projecting back of the 

 pedicel along the proximal margin. Tliis bulla is turned down so 

 that its long axis is parallel with that of the maxillae and its concave 

 ventral surface is applied to the outside of the gill filament, instead 

 of being buried in its tissue. 



MaxiUipeds with a stout basal joint and a short, slender, curved 

 claw; the latter with an accessory spine near the center of its inner 



iKongl. Svenska Vetenskaps Academiens Handlingar, vol. 12. 



